#define _CRT_SECURE_NO_WARNINGS 1

#include<stdio.h>
int main()
{
    int x = 0;
    int y = 0;
    int x1 = 0;
    int y1 = 0;
    scanf("%d%d%d%d", &x, &y, &x1, &y1);
    if (x - x1 == 0)
    {
        if (y - y1 == 1)
        {
            printf("d\n");
        }
        if (y1 - y == 1)
        {
            printf("u\n");
        }
    }
    if (y - y1 == 0)
    {
        if (x - x1 == 1)
        {
            printf("l\n");
        }
        if (x1 - x == 1)
        {
            printf("r\n");
        }
    }



    return 0;
}